Dear Anni2,
This sounds like appropriate care for your baby and should reduce the likelihood of infection. It is worth testing with a Hepatitis B panel just to confirm that the vaccine has worked, and this will also set your mind at ease in confirming that there has been no infection. My understanding is that this should be done 3–12 months after they complete the infant vaccine course.
TDF concentrations are relatively low in breast milk and breastfeeding has shown to be safe for infants:
- Low levels of tenofovir in breast milk support breastfeeding in HBV-infected mothers treated with tenofovir disoproxil fumarate - ScienceDirect
- Breastfeeding While Taking Lamivudine or Tenofovir Disoproxil Fumarate: A Review of the Evidence | Clinical Infectious Diseases | Oxford Academic
Hope this helps,
Thomas